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How to find the answer to number 2

How to find the answer to number 2-example-1
User Kosnkov
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If 8/11 people carry a briefcase, this means that 3/11 people do not carry a briefcase (i.e. 1 - 8/11).

If we assume this proportion applies across all 700 people, what could we do next?
User Bosco
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